Question

1.The tower crane is used to hoist a 2-Mg load upward at
constant velocity. The 1.5-Mg jib BD and 0.5-Mg jib BC have centers
of mass at G1 and G2 , respectively. Determine the required mass of
the counterweight C so that the resultant moment produced by the
load and the weight of the tower crane jibs about point A is zero.
The center of mass for the counterweight is located at G3.

2. The tower crane is used to hoist the 2-Mg load
upward at constant velocity. The 1.5-Mg jib BD , 0.5-Mg jib
BC , and 6-Mg counterweight C have centers of mass at G1 ,
G2 , and G3 , respectively. Determine the resultant moment
produced by the load and the weights of the tower crane
jibs about point A and about point B